diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2013-09-06 00:57:50 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-09-06 01:19:37 +0200 |
| commit | c407c73457df8002142dfb043486a102e79b17b2 (patch) | |
| tree | 78b651c4be75a6dcce8b9354b28b7885b54df7a9 /libavcodec/mjpegdec.c | |
| parent | 1deeb9437c9c0e1f9cb708b24a4d0dedaee7bab3 (diff) | |
avcodec/mjpegdec: 12bit Grayscale support
Fixes part of Ticket2812
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/mjpegdec.c')
| -rw-r--r-- | libavcodec/mjpegdec.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c index 0d619efe49..856947b656 100644 --- a/libavcodec/mjpegdec.c +++ b/libavcodec/mjpegdec.c @@ -232,11 +232,6 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) if (s->bits == 9 && !s->pegasus_rct) s->rct = 1; // FIXME ugly - if (s->bits != 8 && !s->lossless) { - av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n"); - return -1; - } - if(s->lossless && s->avctx->lowres){ av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n"); return -1; @@ -270,6 +265,12 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) "bits/component or 16-bit gray"); return AVERROR_PATCHWELCOME; } + if (!s->lossless && !(s->bits <= 8 || nb_components == 1)) { + avpriv_report_missing_feature(s->avctx, + "lossy that is not <= 8 " + "bits/component or 16-bit gray"); + return AVERROR_PATCHWELCOME; + } s->nb_components = nb_components; s->h_max = 1; s->v_max = 1; @@ -1052,6 +1053,7 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, const uint8_t *reference_data[MAX_COMPONENTS]; int linesize[MAX_COMPONENTS]; GetBitContext mb_bitmask_gb; + int bytes_per_pixel = 1 + (s->bits > 8); if (mb_bitmask) init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height); @@ -1101,7 +1103,7 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, y = 0; for (j = 0; j < n; j++) { block_offset = (((linesize[c] * (v * mb_y + y) * 8) + - (h * mb_x + x) * 8) >> s->avctx->lowres); + (h * mb_x + x) * 8 * bytes_per_pixel) >> s->avctx->lowres); if (s->interlaced && s->bottom_field) block_offset += linesize[c] >> 1; @@ -1123,9 +1125,15 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, s->dsp.idct_put(ptr, linesize[c], s->block); if (s->bits & 7) { int block_x, block_y; + if (s->bits > 8) { + for (block_y=0; block_y<8; block_y++) + for (block_x=0; block_x<8; block_x++) + *(uint16_t*)(ptr + 2*block_x + block_y*linesize[c]) <<= 16 - s->bits; + } else { for (block_y=0; block_y<8; block_y++) for (block_x=0; block_x<8; block_x++) *(ptr + 2*block_x + block_y*linesize[c]) <<= 8 - s->bits; + } } } } else { |